CWNA-107 Free Practice Test

A string of characters and digits is entered into an AP and a client STA for WPA2 security. The string is 8 characters long. What is this string called?

1. A. MSK
2. B. WEP key
3. C. Passphrase
4. D. PSK

Correct Answer: C
http://www.arubanetworks.com/techdocs/ArubaOS_64x_WebHelp/Content/ArubaFrameStyles/VirtualAPs/SSID

What statement about 802.11 WLAN bridges is true?

1. A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
2. B. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
3. C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
4. D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge

Correct Answer: C

What 802.11 network configuration would result in multiple stations broadcasting Beacon frames with the same BSSID but with different source addresses?

1. A. A single AP supports multiple BSSs with different SSIDs.
2. B. An SCA network is in use.
3. C. Multiple APs have been loaded with the same configuration from an image file.
4. D. An IBSS is used instead of a BSS.

Correct Answer: D
Reference https://www.safaribooksonline.com/library/view/80211-wireless-networks/0596100523/ch04.html

In a long-distance RF link, which statement about Fade Margin is true?

1. A. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
2. B. The Fade Margin of a long-distance radio link should be equivalent to the receiver’s low noise filter gain.
3. C. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of
4. D. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.

Correct Answer: D

You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

1. A. The short guard interval is also enabled.
2. B. The clients are all 802.11n STAs or lower
3. C. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
4. D. All clients implement single spatial stream radios

Correct Answer: C